Results 1 to 8 of 8

Thread: GPU - PSU power cable connection

  1. #1
    Join Date
    Oct 2015
    Location
    Canada
    Posts
    5
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default GPU - PSU power cable connection

    Hello,

    I have a Corsair RM650x which is a single rail PSU and comes with 4 x PCIe 6+2-Pin which in reality is two cables with two connectors on each of them. I'm buying a GTX 980 TI which needs two plugs. is there any upside to using the two separate cables to connect to each of the plugs on the GPU or can I just use a single cable with both connectors?

    thanks

  2. #2
    Join Date
    Nov 2015
    Location
    U.S.A.
    Posts
    1,264
    Thanks Thanks Given 
    327
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    There is an upside to both. Using two separate cables is better from an electrical standpoint, Less load on those cables and I saw a recent post from another forum member here who stated that using separate cables could allow for better voltage regulation due to the additional vsense wiring.

    Now, from a visual standpoint, using one single cable sure looks a lot nicer.

    But either way you do it it's no biggie, not something to lose sweat over.

  3. #3
    Join Date
    Oct 2015
    Location
    Canada
    Posts
    5
    Thanks Thanks Given 
    0
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    Quote Originally Posted by turkey3_scratch View Post
    There is an upside to both. Using two separate cables is better from an electrical standpoint, Less load on those cables and I saw a recent post from another forum member here who stated that using separate cables could allow for better voltage regulation due to the additional vsense wiring.

    Now, from a visual standpoint, using one single cable sure looks a lot nicer.

    But either way you do it it's no biggie, not something to lose sweat over.
    thanks

  4. #4
    Join Date
    Jun 2010
    Location
    The Netherlands
    Posts
    5,312
    Thanks Thanks Given 
    379
    Thanks Thanks Received 
    101
    Thanked in
    79 Posts

    Default

    Quote Originally Posted by turkey3_scratch View Post
    I saw a recent post from another forum member here who stated that using separate cables could allow for better voltage regulation due to the additional vsense wiring.
    .
    No, better voltage regulation due to less resistance, more current means more resistance and larger voltage drop. For a GTX 980 Ti, without overclocking one cable should work. But with some heavy overclocking better go for two cables.

  5. #5
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    16,064
    Thanks Thanks Given 
    538
    Thanks Thanks Received 
    270
    Thanked in
    196 Posts

    Default

    Yeah. There's no vSense wire on the PCIe.

  6. #6
    Join Date
    Nov 2015
    Location
    U.S.A.
    Posts
    1,264
    Thanks Thanks Given 
    327
    Thanks Thanks Received 
    0
    Thanked in
    0 Posts

    Default

    But Orion said:
    3.3V sense wire for the ATX 24pin connector and some +12V wires in PCI-e ones are recommended in the PSU Design Guide, while additional +12V sense wires are added by PSU companies.
    So I'm guessing that it's recommended but never implemented?

  7. #7
    Join Date
    Oct 2006
    Location
    jonnyGURU forums, of course!
    Posts
    16,064
    Thanks Thanks Given 
    538
    Thanks Thanks Received 
    270
    Thanked in
    196 Posts

    Default

    Not sure what you're asking.

    +3.3V sense is ALWAYS implemented or the PSU can't be considered ATX compliant.

    +12V sense in the PCIe is never implemented because it was never adopted into the ATX standard.

  8. #8
    Join Date
    Aug 2014
    Posts
    980
    Thanks Thanks Given 
    330
    Thanks Thanks Received 
    21
    Thanked in
    13 Posts

    Default

    Quote Originally Posted by turkey3_scratch View Post
    But Orion said
    Right after that I said that +12V sense isn't in the ATX guidelines after all, just in the PCI-SIG guidelines. I phrased my original post poorly.
    Quote Originally Posted by Orion View Post
    the PSU Design Guide only mentions +3.3V sense wires, while the PCI-e +12V sense was recommended by PCI-SIG (...) but ditched in the end.

Similar Threads

  1. Power Supply Cable
    By MNUR90 in forum For Sale/Trade
    Replies: 11
    Last Post: 10-30-2018, 04:32 PM
  2. 12v ATX Power Connection HELP!!!
    By b1gdeano in forum PC Power Supply Discussion
    Replies: 3
    Last Post: 02-17-2008, 05:47 PM
  3. Making my own connection.
    By Dimmo in forum PC Power Supply Discussion
    Replies: 4
    Last Post: 01-17-2008, 07:30 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •